1672135981 has 8 divisors (see below), whose sum is σ = 1704487104. Its totient is φ = 1640029440.

The previous prime is 1672135957. The next prime is 1672136003. The reversal of 1672135981 is 1895312761.

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 1672135981 - 2¹⁹ = 1671611693 is a prime.

It is a super-2 number, since 2×1672135981² = 5592077477909664722, 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 (1672135921) 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, 47311 + ... + 74716.

It is an arithmetic number, because the mean of its divisors is an integer number (213060888).

Almost surely, 2^1672135981 is an apocalyptic number.

It is an amenable number.

1672135981 is a deficient number, since it is larger than the sum of its proper divisors (32351123).

1672135981 is a wasteful number, since it uses less digits than its factorization.

1672135981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122291.

The product of its digits is 90720, while the sum is 43.

The square root of 1672135981 is about 40891.7593287450. The cubic root of 1672135981 is about 1186.9266032626.

The spelling of 1672135981 in words is "one billion, six hundred seventy-two million, one hundred thirty-five thousand, nine hundred eighty-one".