1520981 has 8 divisors (see below), whose sum is σ = 1896384. Its totient is φ = 1185120.

The previous prime is 1520971. The next prime is 1520983. The reversal of 1520981 is 1890251.

It is a happy number.

1520981 is nontrivially palindromic in base 6.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1520981 - 2¹⁸ = 1258837 is a prime.

It is a super-2 number, since 2×1520981² = 4626766404722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1520981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9800 + ... + 9953.

It is an arithmetic number, because the mean of its divisors is an integer number (237048).

2^1520981 is an apocalyptic number.

1520981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1520981 is a deficient number, since it is larger than the sum of its proper divisors (375403).

1520981 is a wasteful number, since it uses less digits than its factorization.

1520981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19771.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1520981 is about 1233.2805844576. The cubic root of 1520981 is about 115.0026716456.

The spelling of 1520981 in words is "one million, five hundred twenty thousand, nine hundred eighty-one".