1554980997 has 4 divisors (see below), whose sum is σ = 2073308000. Its totient is φ = 1036653996.

The previous prime is 1554980983. The next prime is 1554981059. The reversal of 1554980997 is 7990894551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1554980997 - 2¹⁰ = 1554979973 is a prime.

It is a super-2 number, since 2×1554980997² = 4835931802062228018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1554980897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259163497 + ... + 259163502.

It is an arithmetic number, because the mean of its divisors is an integer number (518327000).

Almost surely, 2^1554980997 is an apocalyptic number.

It is an amenable number.

1554980997 is a deficient number, since it is larger than the sum of its proper divisors (518327003).

1554980997 is an equidigital number, since it uses as much as digits as its factorization.

1554980997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518327002.

The product of its (nonzero) digits is 4082400, while the sum is 57.

The square root of 1554980997 is about 39433.2473554994. The cubic root of 1554980997 is about 1158.5328749533.

The spelling of 1554980997 in words is "one billion, five hundred fifty-four million, nine hundred eighty thousand, nine hundred ninety-seven".