1213011957 has 8 divisors (see below), whose sum is σ = 1617776640. Its totient is φ = 808460960.

The previous prime is 1213011929. The next prime is 1213011979. The reversal of 1213011957 is 7591103121.

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 1213011957 - 2⁶ = 1213011893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213011907) 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, 39669 + ... + 63242.

It is an arithmetic number, because the mean of its divisors is an integer number (202222080).

Almost surely, 2^1213011957 is an apocalyptic number.

It is an amenable number.

1213011957 is a deficient number, since it is larger than the sum of its proper divisors (404764683).

1213011957 is a wasteful number, since it uses less digits than its factorization.

1213011957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106843.

The product of its (nonzero) digits is 1890, while the sum is 30.

The square root of 1213011957 is about 34828.3211912375. The cubic root of 1213011957 is about 1066.4856771803.

The spelling of 1213011957 in words is "one billion, two hundred thirteen million, eleven thousand, nine hundred fifty-seven".